Dirt shield for rock drills



0. E. CLARK.

. DIRT SHIELD FOR ROCK DRILLS.

APPLICATION FILED mu, 7. 1919.

1,408,691 Patented Mar- 7, 1922.

ll! 1 /4 i l v L? O H .1 l l A I I 6 l INVENTOR W Arm/may UNITED STATES PATENT OFFICE.

OMAR E; CLARK, or DENVER, ooLoaAno, ASSIGLNOR To THE DENVER noox mum. MANUFACTURING COMPANY, or DENVER, COLORADO, A CORPORATION OF DELAWARE.

Application filed January 7, 1919. Serialv No. 270,055.

To all w/wmc't may concern.

Be it known that I, OMAR E. CLARK, a citizen of the United States, residing at Denver, in the county of Denver, and State of Colorado, have invented certain new and useful Improvements in Dirt Shields for Rock Drills, of which the following is a specification.

The present invention relates to, means for shielding the working parts of a rock drill from detritus and dirt, and is more particularly intended for stoping machines, on to which the cuttings fall in drilling upwardly directed holes.

The object is to provide a very simple device that will effectively cover the joint be tween the chuck sleeve and its holder or head, said device being readily applicable to and removable from the machine, and as an. article of manufacture being inexpensive to produce and consequently to replace when worn or injured.

In the accompanying drawings Figure 1 is a vertical sectional view through the front head portion of a rock drilling apparatus with the guard or shield in place.

Figure 2 is a View in elevation of the same,

Figure 3 is a detail view somewhat diagrammatic in its character and illustrating the normal relative size of the chuck sleeve and the shield opening in which said sleeve is engaged.

In the embodiment illustrated the motor may be of any desired character and is shown as comprisinga barrel t in which operates a hammer piston 5 that delivers its blows against a tappet 6. On the front end of the barrel is secured, by the usual side bolts 7, a head 8 having a rounded front end 9. In this head is rotatably mounted a chuck sleeve 10 having a socket or bore that is angular in cross section to receive the rear end of a steel or other tool 11 loosely engaged therein and adapted to bear at its rear end against the front end of the tappet 6. The chuck sleeve can be rotated by any suitable means, as for example, a motor, the casing of which is shown at 12, this motor driving a worm shaft 18 meshing with a worm gear 14 formed upon the sleeve 10.

The structure as thus far described is a well known type, and it will be evident that in stoping work the cuttings falling from Specification of Letters Patent.

Patented Mar. 1922.

the drill hole will lodge-upon, and in fact,

end of the sleeve and is curved as illustrated to conform substantially to the curvature of the end 9 of the head. Surrounding the central opening of said hood, is a bead 18 that is engaged in the groove 16. By referring to Figure 3, it will be noted that the normal diameter of the central opening of said hood is less than the diameter of the projecting portion of the sleeve 10, and consequently when the hood is engaged in the groove, it is stretched. This not only effects a more secure mounting for the hood, but it also serves to make a tight joint between said hood and sleeve.

With this arrangement as disclosed, it will thus be evident that the cuttings and dirt falling upon the machine, will be directed by the hood over the end of the head 8 and j that the joint between said head and sleeve is fully covered and protected.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportionand minor details of construction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In rock drilling apparatus, the combination with a motor having a head, of a tool receiving chuck sleeve projecting from said head, and a resilient hood having an opening normally of less diameter than the sleeve and a reinforcing bead surrounding the opening, said hood being expanded over said sleeve and covering the joint between the sleeve and head.

2. In rock'drilling apparatus, the combination with a motor having a head, of a tool receiving chuck sleeve projecting from said head and having an annular groove 'in its projecting portion, and an elastic hood having its inner portion surrounding and con-' tractedin the groove and held thereby,said hood projecting over the head and covering the joint between the sleeve and head;

3. In rock drilling apparatus, the combination with a motor having a head, ofa tool receiving chuck sleeve projecting from said head, said sleeve having an annular groove in its projecting portion, and a resilient hood having a central opening of less diameter than the sleeve and surrounded by an inner bead that is seated in the groove, said hood extending over the head and covering the 15 joint between the sleeve and head."

In testimony whereof, I aflix my signature in the presence of two witnesses.

OMAR E. CLARK.

Witnesses: i I

SULLIVAN TH ONE, M. S. DAVIDSON. 

